Apart from the thin bezels and the redesigned corners, the 2018 iPad Pro tablets are said to come with IPS LCD touchscreen plus the second-gen Apple Pencils, slimmer profiles (not including the rear camera), a USB-C port and a smart connector, True Depth camera setups with Face ID support, and, of course he latest 7 nm A12 Bionic SoC.
https://www.notebookcheck.net/2018-iPad-Pro-design-and-hardware-updates-revealed-in-Bloomberg-report.347161.0.html